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Hooker Headers 4" Sidetube Slip-In Mufflers Big Block Reverse Flow

Hooker Headers 21003

520-21003

Hooker Headers 4" Sidetube Slip-In Mufflers Big Block Reverse Flow $246.95
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Estimated to ship directly from the manufacturer on 07/03/18
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Doug's Headers Side Tube Mufflers Reverse Flow
Doug's Headers 776-D951
$249.99
View Details
4'' Sidetube Slip-In Mufflers
  • Big Block Reverse Flow

  • Hooker Headers 21003 Details

    Slip-In Mufflers

  • Long Lasting
  • Easily Removed For Racing
  • Quieter Than Glasspack
  • High Level Of Sound Control
  • Will Not Restrict Engine Efficiency

  • Specifications:

    Body Length (in.)
    N/A
    Material
    N/A
    Outlet Size (in.)
    4
    Inlet Size (in.)
    4
    Overall Length (in.)
    NA
    Body Width (in.)
    N/A
    Body Height (in.)
    N/A
    Outlet Type
    OEM
    Inlet Type
    OEM
    Inlet Position
    OEM
    Outlet Position
    OEM
    Shape
    Round
    Muffler Count
    2
    Quantity
    Sold as a pair
    Inlet Connection Type
    Weld-On
    Inlet Connection Type
    Clamp On
    Position
    N/A
    Outlet Connection Type
    Pipe
    Diameter (in.)
    4
    Exhaust Insert Material
    Steel
    Exhaust Insert Style
    Louvered core
    Exhaust Insert Finish
    Natural
    Shipping Weight:
    23.00
    Package Height:
    36.000
    Package Width:
    9.000
    Package Depth:
    5.000
    Manufacturer's Part Number:
    21003HKR

    Manufactured using lightweight mandrel bent 18-gauge tubing, Super Competition Sidemount Headers offer the most aggressive style and performance for your 1963-82 Corvette! Testing on a 1968 Corvette with a 427 engine, Sidemount Headers, Side Pipe Tubes, and Maximum Flow Slip-In Mufflers produced an increase of 40 horsepower and 20 ft/lbs of torque (more than undercar exhaust with turbo mufflers).

    Features
  • Designed for optimal performance
  • Tuned-length primary tubes for maximum exhaust scavenging and velocity
  • Lightweight yet sturdy 18-gauge tubing mandrel bent for smooth exhaust flow
  • Long transition collector for decreased backpressure
  • 5/16'' machined flanges for a perfect seal
  • Industry's best welds for durability
  • Slip-fit side tubes for leak-free seal
  • All necessary hardware included for a complete installation
  • Replacement Hooker Mufflers available in a straight-through, glasspack or reverse-flow version
  • Available in five finishes to suit your needs (see listings below for product availability) -

    Black Painted(Part numbers do not have a suffix)

    Chrome (Special Part numbers do not have suffix)

    Metallic Ceramic Coating (Part numbers have a -1 suffix)

    Stainless Steel (Part numbers have a -3 suffix)

    Titanium Ceramic Coating (Part numbers have a -4 suffix)

    Note: All products sold in pairs

  • Does Hooker Headers 21003 fit your vehicle?

    Narrow Results

    1978-1979 CHEVROLET CORVETTE

    • EngineType: ALL
    • SubModel: ALL

    1965 CHEVROLET CORVETTE

    • CC: 6489
    • Liter: 6.5
    • SubModel: BASE
    • CUI: 396
    • EngineType: V8 ( 6.5 L / 396 )

    1963-1968 CHEVROLET CORVETTE

    • CC: 5358
    • Liter: 5.3
    • SubModel: BASE
    • CUI: 327
    • EngineType: V8 ( 5.3 L / 327 )

    1966-1969 CHEVROLET CORVETTE

    • CC: 6998
    • Liter: 7.0
    • SubModel: BASE
    • CUI: 427
    • EngineType: V8 ( 7.0 L / 427 )

    1968 CHEVROLET CORVETTE

    • Liter: 5.4
    • SubModel: BASE
    • CUI: 327
    • EngineType: V8 ( 5.4 L / 327 )

    1972 CHEVROLET CORVETTE

    • CC: 5737
    • Liter: 5.7
    • Aspiration: N
    • SubModel: BASE
    • Engine Vin: J
    • CUI: 350
    • EngineType: V8 ( 5.7 L / 350 )

    1982 CHEVROLET CORVETTE

    • EngineType: ALL
    • SubModel: COLLECTOR'S EDITION

    1972-1974 CHEVROLET CORVETTE

    • CC: 7441
    • Liter: 7.4
    • SubModel: BASE
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    1963-1965 CHEVROLET CORVETTE

    • CC: 5358
    • Liter: 5.3
    • SubModel: BASE
    • CUI: 327
    • EngineType: V8 ( 5.3 L / 327 )

    1976 CHEVROLET CORVETTE

    • Liter: 5.7
    • Aspiration: N
    • SubModel: STINGRAY
    • Engine Vin: L
    • CUI: 350
    • EngineType: V8 ( 5.7 L / 350 )

    1974 CHEVROLET CORVETTE

    • CC: 5737
    • Liter: 5.7
    • Aspiration: N
    • SubModel: BASE
    • Engine Vin: T
    • CUI: 350
    • EngineType: V8 ( 5.7 L / 350 )

    1977 CHEVROLET CORVETTE

    • Liter: 5.7
    • Aspiration: N
    • SubModel: BASE
    • Engine Vin: L
    • CUI: 350
    • EngineType: V8 ( 5.7 L / 350 )

    1972 CHEVROLET CORVETTE

    • CC: 5737
    • Liter: 5.7
    • Aspiration: N
    • SubModel: BASE
    • Engine Vin: L
    • CUI: 350
    • EngineType: V8 ( 5.7 L / 350 )

    1975 CHEVROLET CORVETTE

    • Liter: 5.7
    • Aspiration: N
    • SubModel: STINGRAY
    • Engine Vin: T
    • CUI: 350
    • EngineType: V8 ( 5.7 L / 350 )

    1974 CHEVROLET CORVETTE

    • CC: 5737
    • Liter: 5.7
    • Aspiration: N
    • SubModel: BASE
    • Engine Vin: L
    • CUI: 350
    • EngineType: V8 ( 5.7 L / 350 )

    1982 CHEVROLET CORVETTE

    • Liter: 5.7
    • SubModel: BASE
    • CUI: 350
    • EngineType: V8 ( 5.7 L / 350 )

    1969-1971 CHEVROLET CORVETTE

    • CC: 5736
    • Liter: 5.7
    • SubModel: BASE
    • CUI: 350
    • EngineType: V8 ( 5.7 L / 350 )

    1980-1981 CHEVROLET CORVETTE

    • Liter: 5.7
    • SubModel: BASE
    • CUI: 350
    • EngineType: V8 ( 5.7 L / 350 )

    1980 CHEVROLET CORVETTE

    • CC: 5031
    • Liter: 5.0
    • SubModel: BASE
    • CUI: 305
    • EngineType: V8 ( 5.0 L / 305 )

    1970-1971 CHEVROLET CORVETTE

    • CC: 7441
    • Liter: 7.4
    • SubModel: BASE
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    1974 CHEVROLET CORVETTE

    • CC: 5737
    • Liter: 5.7
    • Aspiration: N
    • SubModel: BASE
    • Engine Vin: K
    • CUI: 350
    • EngineType: V8 ( 5.7 L / 350 )
    Items You Need
    Some parts are not legal for use in California or other states with similar laws / regulations